Office (OOXML) / .XLSX malware analysis — malicious · 46bcde824114484f

MALICIOUS

Office (OOXML) / .XLSX

1.55 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: e15cba1287fd9a0d755685df0c8d24e2 SHA-1: 39be11722c3417a9e330dd265cae7d30c2b23c32 SHA-256: 46bcde824114484f405e35827ddd2a1520ba1349644cd0bd7d9bead3f3d83730

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and likely exploits CVE-2018-0798, a vulnerability in Equation Editor. This suggests the document is designed to exploit this vulnerability to execute a malicious payload. No document body or scripts were extracted, but the presence of the exploit is sufficient evidence.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Q5.8zIBj contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY

Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `ffafee394e6c8ffe1f2ae22814e28f62da7d07fbf1477055e6004c3336825118`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Q5.8zIBj	1910272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `8f841d70b5bf06cade3010f1829b8347cc79df55c3decd0a37b781c5174f4d9b`	ole-package	OOXML xl/embeddings/Q5.8zIBj Ole10Native stream: OLE10naTiVE	1892483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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